# Listing of Parameters # --------------------- subsection Boundary conditions # Driver boundary condition for the problem set Driver = Neumann # Positive stretch applied length-ways to the strip (Driver = Dirichlet) set Final stretch = 2.0 # Hydrostatic pressure applied to top surface of the strip (Driver = Neumann) # Some reasonablly interesting choices here are -150 and +50 set Applied pressure = -150.0 # Total time over which the stretch/pressure is ramped up set Load time = 1.0 end subsection Finite element system # Displacement system polynomial order set Polynomial degree = 1 # Gauss quadrature order set Quadrature order = 2 end subsection Geometry # Total sample length set Length = 100.0 # Total sample width set Width = 50.0 # Total sample thickness set Thickness = 5.0 # Hole diameter set Hole diameter = 20.0 # A geometric factor affecting the discretisation near the hole set Hole division fraction = 0.5 # Number of initial grid subdivisions in the cross-section set Number of subdivisions in cross-section = 2 # Number of initial grid subdivisions through the thickness set Number of subdivisions thickness = 6 # Global refinement level set Global refinement = 1 # Global grid scaling factor set Grid scale = 1e-3 end subsection Linear solver # Linear solver iterations (multiples of the system matrix size) set Max iteration multiplier = 1 # Linear solver residual (scaled by residual norm) set Residual = 1e-6 # Type of solver used to solve the linear system set Solver type = cg end subsection Material properties # Poisson's ratio set Poisson's ratio = 0.4995 # Elastic shear modulus set Elastic shear modulus = 80.0e6 # Viscous shear modulus set Viscous shear modulus = 160.0e6 # Viscous relaxation time set Viscous relaxation time = 2.5 end subsection Nonlinear solver # Number of Newton-Raphson iterations allowed set Max iterations Newton-Raphson = 10 # Displacement error tolerance set Tolerance displacement = 1.0e-6 # Force residual tolerance set Tolerance force = 1.0e-9 end subsection Time # End time set End time = 25.0 # Time step size set Time step size = 0.1 end